diff --git a/model/model.md b/model/model.md
index 45ddbc7..f0e56a2 100644
--- a/model/model.md
+++ b/model/model.md
@@ -40,6 +40,7 @@ erDiagram
   %% relationships
 
   Tournament ||--|{ Round: ""
+  Round }o--|{ Player: "participate"
   Round ||--|{ Game: ""
   Game ||--|| Player: "black"
   Game ||--|| Player: "white"